Waits forever on etcd when using etcd 3.4

[tmccombs]

With etcd 3.4.7 the expected line "ready to serve client requests" never appears.

Instead it has the following lines:

2020-04-18 23:52:59.873615 I | embed: ready to serve client requests
2020-04-18 23:52:59.875402 N | embed: serving insecure client requests on 127.0.0.1:2379, this is strongly discouraged!

Is there a reason that etcd uses wait_for_line instead of wait_for_port? It seems like the latter would be more stable.

[stephenfin]

This was fixed in #135 but that hasn't been released yet 😞